The idea is that all the quantum mechanical information inside a black hole can in certain circumstances be considered as spread out on the boundary of the black hole.
If you think of the interior of the black hole as a three-dimensional region of space, and the boundary as a two-dimensional boundary, one can think of all the information of the black hole as being located on the boundary. That’s holography because there’s a two-dimensional boundary that is filling the three-dimensional inside.
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Strange things happen when you try to combine Einstein’s description of curved space-time with a universe made up of quantum wavefunctions. This podcast shows how space and time are emergent properties of quantum reality but not fundamental parts of it.
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